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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b384f4f6bdf6f24a0fa090b8d564aaa8511b4075b18ad004680ee68412fa591e' 
  AND token = 'q4jRPuWWIARQnJzH8MUkIWm/+/BtuW718SkmnrymnMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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