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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2e1328fb9f670c19eabca402e28034e3d5a2372d6374411c00b66cadfc596f1' 
  AND token = 'pWY+mdO1nYnWQlA+FBuUJIyWhyANsq0P2EltKrDCQYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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