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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff0592b65cff2bfd868c5e53de82d4fb3baafc01a18501707752eb6ee374e6f6' 
  AND token = 'I/fYG39WI1yJNk9Zz742prbB1VItzB0SbH2B4jrtQhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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