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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c197b19b9ce067f669994494c7de2ec5035b19a1ab4325c13125c30bda4650' 
  AND token = 'WG9WrfuUMNRxT2KnZ1JHaowgy5a7ZLfBLzl6QX6J3kQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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