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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5723f41af2db2aeca4e566ec5d2f62483ad0962caa758534ece7e512cc747d50' 
  AND token = 'FWzaDIg8szcUMuD5XKJZVRNYuYe2CIStbMzqqS0W0Zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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