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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baf615a46719443963c74c1318169ec6ce7e6bed75e6102695c3add0f4c3891f' 
  AND token = 'Cw7/dEFa0VWN88nGlqS97NDGataaJ0twe1L5bOT8dH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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