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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ce9db87d7943b5b3c7070bec0b2ae77545d1c04fff0e0b57c4ec1da41bd9fee' 
  AND token = 'n5B1XZcJsF9pLrxk/5K+iaWU+GOglushsyO8s7wusGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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