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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '469d297ac6b3b9ee05eba7d8497c2c57c158d755ef4903af7a2036ad8ac7eec5' 
  AND token = 'luwneO9J9F7j74Fea07h86Hrsb05r0q8dc9rMTk1Sa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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