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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9e06921170e005002664c9d17fea7ab5c3d30290218da75c7a09b5b26193d58' 
  AND token = '6gTcxRO2ZuLXSbgj8PYGQnedb+9PF2+MG3yEyukhBCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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