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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a00f23a761e819a7a3dbbe280e27a8a8f1beb60a8645ee8151d02883356ee98c' 
  AND token = '2w5ufY6FNsWWAUEZcSysmCq8k6sLYb1C9Lt5/0b84mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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