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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc612f38cb4dd6fa31bc0dfe103b3bcec00b11e358091aabb0f6da3f09789636' 
  AND token = 'DNqmrV8T8BeXU/bZasUM1fwAHHNNTS23WZW4IVI0aVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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