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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bc5f8fc3d7bdc8f91b96c037f973f98d33c2b77345fad802f025b28c6538f4e' 
  AND token = '/iCBIGBlwWcRJq+gP9ffUQw3E6woG6l4J51KdfCfMvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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