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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76bac30f7ecf7fc719d941aff0a83d3ae0f4e1d9c757c3c54e08bf20d44d5269' 
  AND token = 'qlblenxKJ6IYZsz1+wANIKyCTJNMXTFQmrD1ISqjwt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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