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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd70618ce9e0a33accac0a535585f2d2795281e1c43bf378529df5fbad1e2d1d3' 
  AND token = 'njWSGlZe4A1VbXSYUY8p+zVLVa1hvOd5FKnFz72jZxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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