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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a2c84a69099305c9cb7607b45f1d1fb5ef47faf8d1e02fdf7931f75734262e1' 
  AND token = '1hkVGetaX6ayehJvQ41HyPiYes2egVV1XN+TC84aHdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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