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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07059e62cfb0488fc07a52d8377544c9662a082536731f4b6a0517d92ac8afca' 
  AND token = 'YScM0pvgDOYcwwhSTk/90ZVQ6PJTgg8UaPVIOcrtCHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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