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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ed4d643e1271ebe136065abc1f7a3a941297336a6e52937e08de6f5eb70c4c0' 
  AND token = 'VpACOVqAv22fh8RkTv7HmSc71sYjz2AnM1NGOuGv+b0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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