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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9af7026c57e75c9f676bfa76fb751e4d22a4b97b4c974b25cf2b5ac0af359a39' 
  AND token = '3022W0DHAOoAXnPmPNqVFFsQi90moKU/cf09UePMLlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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