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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b845f2ee3b36a5460890865f79af94247e842f8d1684eec68acb995867e08535' 
  AND token = 'rKCAplrif080F+hLN3U+UrkJB58l0Y3wOcIC7kJNNa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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