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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '594dedc947a8d9e4cc9199f4e198a92c3ff5b746db5f8e1dd5f0759c049d876e' 
  AND token = 'EbXmDsM71AqMy28EF9u2tTMR2lv1imOUp9ABzFDYy9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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