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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb86b2edb478d6332813b6142ff1914d14168cf0b0a002cd5bc5b1bb74019bae' 
  AND token = 'cmfp/BqpJt50BUQ4CDOkJtofLOYofBJbgEckQg00gsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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