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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b81b5ea52b8f9eec292fe43d5b3bcdc9fefb20b63ea7ebefb570a7b8299721a9' 
  AND token = 'uzMjS33WQT2D6XD9GDZQ4x4rQkB3H6DMksWJXS8o6PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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