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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4020b358fedd8ad8e78da76854f7238e102ff471af2d69e4563f33bc80628f43' 
  AND token = 'CADjkaOBxVz28YUECX+lIsSzZ3w2GGT5cMZ25+2mUbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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