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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93f7312912bb50d0327278623ee8d4e91bf5d43c7a45cf1e4e8503af70990619' 
  AND token = 'ueX6ZeF79Hv2dA/0NHCGy+OhFXzO17h3pRSZjPLej10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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