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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1322b60158f2efc1da9553247ac03adea8cc44afa2ae88ed4e616b99c83a06c' 
  AND token = 'BUKtSv8pkgRfqepaVq/jUIUCm5grltJeHD+OjaBg0P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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