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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aab04b144292c00f0ff10a23bced66df92117372414c8b6f4ece6a8f53e3623' 
  AND token = 'VDydy4VJXji4+olPtao9kIJ6mXDi+koW3CjAqFb6VGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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