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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbfc8efd8a9f983369e39675d77669598fd8db28cafea01b0af99a76d859c308' 
  AND token = 'huILY48npK2usAJqd/wlxd0+nLLZWaWFiQZTKH88yZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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