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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9618d33c3ef1eb80266ca4a9beb6615b94fbdbe0656266c041c4fedcbbee581b' 
  AND token = 'u9sWzGcyraU8+plk2OoKlMQAh9D5lgZKAbIvo6/3X+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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