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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec5d74993f7e0f1f704ca6d7aa88dce7d6f1efe014a0b06895465c146764c512' 
  AND token = '/4SYyzy0hv0w3SQzOGwcUa32Z4UAWjMryZ592FL39CI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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