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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3abfd8b591d2d8e9c69f3afdc4eb0c42f04e64fe8695049b5336bed3a0babc39' 
  AND token = 'hWbatZkZ9rlgse6NFWU29kIGZM3e8zOIk1WnewfLOA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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