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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc216ed4231e3d8774283fd9bec78084bee01f8960dcf4afadebd16cd1828a82' 
  AND token = 'mqFEu6ArgHYu5TSIjLi5t2OD3WYGYuEZpo2njCX2se8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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