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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b3b324850844b707cc9e8366b98dd4faf509eb75559638d222c1e70d11e87e7' 
  AND token = 'WuxZPvIA0W84yLjr+qDcD5NmIbpgPOMurQRJUYFeNPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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