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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b8ddaa19636bd668da1c6447141ee0a17e96cd9c117862abdaa6f2917d84d86' 
  AND token = 'yKvm4jAGerTWSM9Gp7Nmp0nWcG/IXaUQwhmqD/TK+nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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