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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bff5c86bfd7b3a3d9f0c2ecc750250fd6aedb95a5e0aba3ee228fc5edb97395d' 
  AND token = 'gEKo78aFqNjermkfVzqm/VeHhH9Ts8OJZ74TzWduOoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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