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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edb666e6ecaadbad645b0132a24b8fa64146675dd7607dc8ae279026285fe46d' 
  AND token = 'e9CdtbfMElArfvLAoxEtPLrTJvSo+JzwTiwmC3y5Gvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}