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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3b3c9564b09f084608dc3e701115340bdf48f42bfb2ccf2c719b2b3527d12a5' 
  AND token = 'dXPlYZRC60hmWjRL1p7KWcictXrN54T44WH1TckCx1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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