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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14be423c6092c3b7e03ba78b71050c87b10b4d038bfa3cd28c15fc26dbb685bc' 
  AND token = 'ju2XBrnRM15z+1llU5AFnc6GNMlvyZvNDtwP6a15mW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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