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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '188fbe4e75cc26b909fe1e90dc94730fc413878270952a6427ab201a9e7bfcb4' 
  AND token = 'vUyaX6t6GtXu375Mn1RBG3e2DsFxSrVBcoCb7MdBDvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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