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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad32d8b212df6e0e67cd1bde41963487f6ae1cca03f6156a0f849ddf9015dcb0' 
  AND token = 'yEC59Gpk9GcTlIlYsZ5AOUtzr0is4CK2ubPPIVZztGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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