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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd78896f6f7090ae03039a23ace347d666704e30cf68bb962bd442d0ac6b6ca38' 
  AND token = 'Av3JG9T7C6zidxrXXpSJHJBiqGEtN8punHmB0endvgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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