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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd79ab0933a7f52fc65e18a6990a2d6d5823e98b0f7c673981a7b70678238147' 
  AND token = '+oRaWBVhEwmxVt7pz59T3lUvbRBsFQW/+TElStPomiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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