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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d3efee56ed16e5e802eac0da8427d97c4be1962557781b97254aab2e9e8350e' 
  AND token = 'HRjJk8YDUQ4yOHP2EgYF3Em1GPe+JYaUn+1mdFEDjl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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