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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f00a9f9cdb95da0accec865be6ad13ba0f40e8210b9431bff7f659ee7d7bc2e7' 
  AND token = 't/g6xq4GlKQdZhcdLLK26JXd66QCOiw0dYQ/rv9uj7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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