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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcd9f633260ff56194dcfcc51f39241aaa06f9b30e5a240dde6dee039617833a' 
  AND token = 'mvUGfECYUDi3oAMhrRiWFfoNZuj+Ws2GjOE7POR4QWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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