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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '874c5f87e6883fe1cf936e968203b36ba32d3373751c59c2ce7663c78bd50a77' 
  AND token = 'k/mbGcPjn5r5LNQ3+SdDU3OvL3O4r61SOJDNsJaX9wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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