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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c93e68cafe2b49d88d8b1066b035fe007f6b4128dfdc1393a4d0488860bd114' 
  AND token = 'uGlLkdqDDn0ROryTvdb0sVApfeX79NokbnTmSzry3Q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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