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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c960ab8fa0d3c993583c6dcfea0731cbd3b5600b6678beb59def4604f4409cfb' 
  AND token = 'ViUM0Z/WRfEqVHUkaTNiaziuvMBVJoH7LU+WsYZnl9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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