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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b68ed8e2b6a24eda5d5caf33c0614f310710c75081eabd54ff315e62c16d4cc6' 
  AND token = '82qSMlqlHMWM+H1vBmLgF3/8gJ5Uv4bUxnYz78UO9dM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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