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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb4288b1dc1f0d56593e387c5f37eab22e89db88c73d24e6c0d689134d762dde' 
  AND token = 'LIIkjk2JYpoUx9Aj83NzgYE6jZsAe8OBXk6BjVSSZDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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