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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '890bde781f8f85878695244861fae5b9d585901c678633d15177b61f0a72ceec' 
  AND token = 's14Uaf5FnmlniK61XAhSez6nYOjcdB3FCP04/rpp370=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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