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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79a5c11199d5396010ab97fc57b4ec653f1659f436f9a3b29b0756459a44c692' 
  AND token = 'MAkKXeKydfkEGLNgD44cyqWUkUnvxJLuSzlXAIHmQ/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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