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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fa4510585e3b2b047dc5b74fd4dda6e8a67f3133ea2c7ab29baa30804f42e74' 
  AND token = '5pOQvazZLOyjFfNcLw35F0ySuC9zsWmZFxEa7RlZwvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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