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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31f66589a6c20cb69d5e8a81d625376e6dd13bbb579f977d0d94844c05364236' 
  AND token = 'jbIN+hWSbVzYcgzNXlqTvK605sl0uciG9YL05lU5kA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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