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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b708a4ac2ce731452ea5a5226fa01d3ade13e4ce3dd37692a955c2affccffd3' 
  AND token = 'Vaq8hX7WVzk7Btt41xA23UiRFOXi0z9/UU3XsT1rKFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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