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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b0c25b339d5406c18c86bb1cdcdee4f9ab9b1b6c263cf9d688e541da3cf685d' 
  AND token = 'uyebNoqGs5tA8Cj4xemvxsOSzp+pJtRbMoEFvYj4UUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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