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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4714266a094f45c2d2702e30a0155190abdccbc364839a76b0d0f6909e441a50' 
  AND token = '7+GuLivgbdqPIi/OJ3wzzcRwGE+lmnfTweASAPMnE3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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