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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '698e4e7eb2b69a289b47a41f51badf7d0fdf669085e70d2ea948c47ecc6232dc' 
  AND token = 'kSNqgCjdLs+249dxWWQGY49ul0Rnrn2W57EONOiu4MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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