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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd26d32a4bbd506ef0724de4582e425ea90d99e7fc1050ead50ea59951f2f310' 
  AND token = '0UEOXOSa7M/a0a7kfDsAwujbFLkUvnETVPEO9sczgY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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