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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f28a5026c36f97d6d87163599c9ea576284b44aba05eaca516cfc1cc51c8e189' 
  AND token = '4AQNfKVv66+OU9CHlrDgYyohfixvaiULQc913Jo/1HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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