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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6ffa8adb4b159ae5c7e1d5a4c0f34fc9c27779527c0a5e6cefe2a4ede0dfe4f' 
  AND token = 'RFH6ZWeVUfEEAxA4tMyrzxkUpYFeMqNv03lEcYAxsCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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