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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebaee786f71ab2cad1dad17717a6c16e266dccda9b812afcf613f3894cf6ae0b' 
  AND token = 'tl5Tcy2p2KNWLzH+66Lm29C6LnsXBf5Hgr8CM/lAtEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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