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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a84a1de8397e530ddce8d922c013782c0211abac261ecc9999bc0f0ec6161509' 
  AND token = 'n8f3Rycihch+0uwmxegmSG36p7Ou+reWbFKO2jZr8Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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