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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acbe5f34cdd7ee1d8d1656f5dca1cdc5db88f26fb8c6234fe063b83232f1ca00' 
  AND token = 'dunf9plmxGUfBD5JmlDVnT3/+2dDiTo11dPsuA7LrH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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